Solution of cellulose.



.cellulose was I pared solution of ammomureted cupric OXlCl.

UNITED STATES PATENT osFroE.

EDUARD sort, or GROSS ANHEIM, AND ERNST BECHTEL, or 'H iIAU, GERMANY, ASSIGNORS' *ro HANAUER KUNSTSEIDEFABRIK, OF HANAU, GERMANY, A coaPoR 'rioN on GERMANY.

SiOLUTION O'F CELLULOSE.

Specification of Letters Patent.

Patented Jan. 8, 1907.

I Application filed June 7.1906. Serial No. 320.644.

To It whom it may concern: l

Be it known that we, EDUARD EoK, of Gross Anheim, and ERNST BEcnTEL, of Hanau, -Germany, subjects of the German Em eror, have invented certain -iew and use ul Improvements in Solutions of-Cellulose,.ofwhich the following is a specification. Our invention relates to the manufacture ofa solution of cellulose with ammoniureted cupric oxid which is fit for the manufacture of cellulose roducts of every description. Hitherto such a solution has been manufactured in the manner that cotton or similar treated with a previously-preihis roccss, however, required an excessively ong time. Attempts have been made to accelerate the I cellulose to be dissolved with agents'for example, a solution of caustic soda; but thisprocess still required eight or ten hours, which of course is too long, for a commercial manufacture on a great scale Our invention consists in a process of roducing the said cellulose solution within a few minutes. This process is characterized in that the solution of ammoniureted cupric oxid is caused to act not in its ready state, but in its nascent state, u on the cellulose.

Our newprocess is as fol ows: First thcceli lulose is impregnated in an aqueous solution of I ammoma, then a paste of cupric oxid is added, and the whole is properly shaken or agitated. The cellulose will readily dissolve,

'com letely ready for Tim process by preparing the and after a few minutes the solution will be use. a

e process may also be modified in that the solution of, ammonia and the "paste of cupric oxid'arc first mixed, and then before any reaction takes place betweenthem the cellulose is added.

The new process also tage that the solution 0 ammoniureted cupric oxid, acting in its nascent state upon the cellulose, will dissolve more cellulose than hitherto. By the known methods it was only possible to produce a solution of eight per centrat the most of cellulose, whereas the new process renders it easy to obtain solutions of ten per cent. and more of cellulose.

Of course such a more concentrated solution the manuwill prove more advantageous for facture of the cellulose products.

We claini- The process of manufacturing a solution of cellulose with ammoniuretcd cupric oxid, which consists in impregnating cellulose in an aqueous solution of ammonia, adding a paste, of cupric oxid, and shaking or agitating the whole.

In ttstimony whereof we have signed our names to this specification in thepresence of two subscribing witnesses.

EDUARD ECK. ERNST BECIITELQ Witnesses: v

FRANZ I-IAssLA'snER, ERWIN DIPPEL.

presents the advan- I 

